Transactions of the Institute of Systems, Control and Information Engineers
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ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668

Transactions of the Institute of Systems, Control and Information Engineers Vol. 12 (1999), No. 9

  • Scheduling Methods for Lot Processes in JIT Production System

    pp. 515-521

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    DOI:10.5687/iscie.12.515

    This paper deals with scheduling methods in a JIT production that includes lot processes. In general, the delayes often occurred in multivolume JIT production systems that include lot processes, because set-up time is increased in the multivolume JIT production. To cope with this difficulty, we propose three scheduling methods to decrease delays and work-in-process inventory in lot processes. Furthermore, we evaluated the methods by numerical experiments.
  • Expansion of Robust Stabilization Using Phase Information

    pp. 522-530

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    DOI:10.5687/iscie.12.522

    The purpose of this paper is to expand the result a of robust stability condition using phase information by Yamada. That is, recent paper can not deal with the set of the system that the number of relative degree of the nominal plant is not equal to that of the real plant. We define a class of uncertainty to include the system that the number of relative degree of the nominal plant is not equal to that of the real plant. A necessary and sufficient robust stability condition for the system with a certain class of uncertainty is presented.
  • A Study on Mutual Selection Scheduling under Multi-Purpose Environment

    pp. 531-539

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    DOI:10.5687/iscie.12.531

    A new scheduling protocol based on market mechanism in microeconomics is proposed in this paper. We define all the manufacturing units, such as machines and jobs, as economic agents, which conduct strong robustness against several manufacturing conditions. Contract-net protocol is focused in our scheduling concept due to its applicability into a scheduling problem. We study the dynamics of the proposed contract-net based scheduling protocol, and confirm its efficiency by several simulation experiments.
  • Estimation of Parameter Bounds for Continuous-Time Systems with Delay and Its Application to Robust I-PD Controller Design

    pp. 540-548

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    DOI:10.5687/iscie.12.540

    In this paper, we derive a method of estimating a model set for a continuous-time delay system. Using δ-operator model, we first transform the estimation problem of a continuous-time delay system to a discrete one in which the system parameters remain in their original form. Then an identification method combining the genetic algorithm (GA) with the modified ellipsoid-bounding (MEB) algorithm is developed in order to estimate the time delay and system parameters together with their bounds. Simulation results are included to show the effectiveness of the present method. Furthermore, the present technique is applied to a closed-loop identification and a robust I-PD controller design.
  • Robust Control Based on Dissipativeness of Open-Loop Systems

    pp. 549-557

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    DOI:10.5687/iscie.12.549

    This paper proposes a robust control design method by imposing dissipativeness on open-loop systems. First, it is shown that stability of nominal feedback systems is equivalent to dissipativeness of open-loop systems. This result justifies imposing dissipativeness on open-loop systems. Second, a robust stability for some class of complex perturbations guaranteed by dissipativeness of open-loop systems is shown. This explains that our method is effective for ensuring gain and phase margins of feedback systems. Third, it is shown that dissipativeness of open-loop systems is equivalent to bounded realness of certain closed-loop transfer functions. This fact implies that H control which evaluates only gain property possesses the ability to take into consideration both gain and phase properties of open-loop transfer functions, as well as it gives a controller design method based on dissipativeness of open-loop systems.
  • High Speed Training of a Fuzzy Classifier with Ellipsoidal Regions

    pp. 558-565

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    DOI:10.5687/iscie.12.558

    In this paper, we discuss a fast training method for a fuzzy classifier with ellipsoidal regions. In the calculation of the degree of membership, first we decompose the covariance matrix into triangular matrices. Then we set small offdiagonal elements relative to diagonal elements to zero, and calculate the degree of membership by skipping zero elements. We demonstrate the effectiveness of our method using several benchmark data.
  • Improvement of the Damping Characteristics for the Superconducting Magnetically Levitated Transportation System

    pp. 566-574

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    DOI:10.5687/iscie.12.566

    Numerical running simulation of the superconducting magnetically levitated system (JR Maglev system) has been undertaken. In this system, the interaction between the propulsion and levitation system is very large. Thus, it is important to reduce the oscillation of the bogie caused by the various disturbance. The damping of the system is shown to be small. So the active damper coil system is proposed to increase the damping between the bogie and the levitation coils on the ground. The effect of the active damper coil is calculated using the running simulation program. From the calculated results, the active damper coil system shows the large effect to decrease the vertical oscillation of the bogie when the voltage in proportion to the acceleration of the vertical oscillation is applied on the damper coils.
  • Attitude Control of Legged Robot Emu Using Constrained Ankle-Torque via Hybrid Control

    pp. 575-577

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    DOI:10.5687/iscie.12.575

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